Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The study of organisms or environmental conditions that have been rendered free of bacteria or contaminants or into which a known microorganism or contaminant has been introduced for research purposes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The science involved with maintaining a microbiologically controlled environment.

Etymologies

Greek gnōtos, known; + biotics, study of living organisms.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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